Dinuclear and layered copper 2-pyridylphosphonates with weak ferromagnetism observed in layer compound Cu(C5H4NPO3)†
Abstract
This paper reports the syntheses and structures of three new copper phosphonates based on 2-pyridylphosphonate, namely, Cu(C5H4NPO3H)2 (1), Cu3(OH)2(C5H4NPO3)2·2H2O (2) and Cu(C5H4NPO3) (3). Compound 1 has a discrete dimeric structure in which the {CuO4N} square pyramids are linked by the {CPO3} tetrahedra through corner-sharing. The dimers are further connected into a chain through hydrogen bonds. In compound 2, edge-sharing {Cu(1)O4N} square pyramids and {Cu(2)O4} planes are found to form an infinite chain with composition {Cu3(µ-OH)2(µ-O)4}. Neighboring chains are linked by the phosphonate groups of the 2-pyridylphosphonate , a = 8.4045(19), b = 8.751(2), c = 10.632(2) Å, α = 66.673(4), β = 72.566(4), γ = 70.690(4)°, V = 664.7(2) Å3, Z = 2.